PG or R

<?php

if(isset($_POST["ver"]))
{
  if($_POST["ver"] == "pg")
  {
    readfile("./html/pg/index.html");
  }
  else if($_POST["ver"] == "r")
  {
    readfile("./html/r/index.html");
  }
  else
  {
    readfile("./html/pg/index.html");
  }
}
else
{
  readfile("./html/pg/index.html");
}

?>